private void FinishStroke(Stroke stroke)
{
//Seal stroke for better performance
stroke.Freeze();
// Remove finished stroke from the collection of strokes in drawing.
_activeStrokes.Remove(stroke.Id);
}
// Touch down event handler.
private void OnTouchDownHandler(object sender, StylusEventArgs e)
{
// If there exist stroke with this ID, finish it.
Stroke stroke;
if(_activeStrokes.TryGetValue(e.StylusDevice.Id, out stroke))
{
FinishStroke(stroke);
return;
}
// Create new stroke, add point and assign a color to it.
Stroke newStroke = new Stroke ();
newStroke.Color = _touchColor.GetColor();
newStroke.Id = e.StylusDevice.Id;
// Add new stroke to the collection of strokes in drawing.
_activeStrokes[newStroke.Id] = newStroke;
}
